[petsc-users] LU vs. ILU

[Matthew Knepley]

On Thu, Feb 3, 2011 at 10:45 AM, Matthew Knepley <knepley at gmail.com> wrote:

> On Thu, Feb 3, 2011 at 10:35 AM, Verena Kuhlemann <vkuhlem at emory.edu>wrote:
>
>> Hello,
>>
>> I am somehow confused with the usage of PCLU and PCILU ind PETSc.
>> It seems as there are the same options to choose from for both.
>> In particular, if I use PCLU and PCFactorSetFill(pc,5)
>> don't I end up with an incomplete LU factorization?
>> If I use PCLU with no other options set, will the
>> factorization be complete?
>>
>
> LU ignores the fill option. It always gives the complete factorization.
>

Hong is right. I did not mean ignore, but rather will always keep
allocating.

   Matt


>    Matt
>
>
>> Thanks,
>> Verena
>>
> --
> What most experimenters take for granted before they begin their
> experiments is infinitely more interesting than any results to which their
> experiments lead.
> -- Norbert Wiener
>



-- 
What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
lead.
-- Norbert Wiener
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